Math Help

Archive for August, 2006

Question: homework help for math?

Alright, I’m having trouble learning on my online math class, any suggestions on what I’m not realizing? The instruct shows this but doesn’t explain…

2/5 = 2 over 5 and so forth, it’s fractions

Solve x – 2/5 = 3/10

10 (x – 2/5) = 10 (3/10)

10x – 10 (2/5) = 10 (3/10)

10x – 4 = 3

10x = 7

x = 7/10

I don’t understand where the 10x – 4 = 3 comes from, nor the 10x = 7. Can someone explain to me how the instruct portion come up with that? I can’t seem to find anywhere how it would fit in. Thanks!
Thanks for the quick responses guys! Much Appreciated!!

Answer: Simply 10 (2/5) and 10 (3/10). You will get:

10 * 2 / 5 = 20 / 5 = 4
10 * 3 / 10 = 30 / 10 / 3

Replace the values into the equation and therefore you will get:

10x – 4 = 3

We will add 4 to both sides of the equation to remove the 4 on the left.

10x – 4 + 4 = 3 + 4
10x = 7

Simply put it, when you want to move a negative value over to the other side, you have to change the sign that it holds, so when you move a positive value over to the other part, you will have to minus that value:

y + 1 = 3
y = 2

Get the drift? (:

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